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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,337,397 | $ 1,162,919
Fair Value | 1,276,732 | 1,064,330
Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 385,871 | 334,460
Fair Value | 363,749 | 303,146
Agency | Mortgage-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 190,218 | 165,507
Fair Value | 174,065 | 145,686
Non-agency | Mortgage-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 57,234 | 63,729
Fair Value | 51,351 | 55,102
Auto loan receivables | Asset-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 62,783 | 53,686
Fair Value | 63,208 | 52,869
Credit card receivables | Asset-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,673 | 3,414
Fair Value | 9,789 | 3,428
Other receivables | Asset-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 65,963 | 48,124
Fair Value | $ 65,336 | $ 46,061

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